The client stations send a probe request management frame aimed at asking what network is available on this channel. The probe requests are usually sent to the broadcast DA address (ff:ff:ff:ff:ff:ff). Once the probe is sent, the client station starts a ProbeTimer countdown and waits for answers. The probe request from body contains the element and fields listed in the following picture.
above the picture from CWAP
wlan.fc.type_subtype == 0x0004
The purpose of a probe request is typically to discover APs and their supported networks. The probe request also is to discover specific elements about the network, for example, what are the local country parameters?
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